XPS628511DRLR中文资料德州仪器数据手册PDF规格书

1 Features

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• Input voltage range: 2.7 V to 6 V

• Output voltage from 0.6 V to 5.5 V

• 1 feedback voltage accuracy (full temperature

range)

• TJ = –40°C to +150°C

• Family of 0.5-A, 1-A, 2-A (continuous), and 3-A

(peak) devices

• Switching frequency in PWM: 2.25 MHz

• External synchronization from 1.8 MHz to 4 MHz

• Forced PWM or PWM/PFM operation

• Quiescent current: 17 μA (typical)

• Adjustable soft start-up to 10 ms

• Precise ENABLE input allows:

– User-defined undervoltage lockout

– Exact sequencing

• 100 duty cycle mode

• Active output discharge

• Power-good output with window comparator

• For device options with selectable compensation,

see the TPS628501

2 Applications

• Motor drives

• Factory automation and control

• Building automation

• Test and measurement

• Multi-function printer (MFP)

• General purpose POL

3 Description

The TPS62851x is a family of pin-to-pin 0.5-A, 1-A,

2-A (continuous), and 3-A (peak) high efficiency, easyto-

use, synchronous step-down DC/DC converters.

They are based on a peak current mode control

topology. Low resistive switches allow up to 2-A

continuous output current and 3-A peak current. The

switching frequency is internally fixed at 2.25 MHz

and can also be synchronized to an external clock

in the range from 1.8 MHz to 4 MHz. In PWM/PFM

mode, the TPS62851x automatically enters power

save mode at light loads to maintain high efficiency

across the whole load range. The TPS62851x provide

a 1 output voltage accuracy in PWM mode, which

helps design a power supply with high output voltage

accuracy. The SS/TR pin allows setting the start-up

time or tracking the output voltage to an external

source, which allows external sequencing of different

supply rails and limits the inrush current during startup.

The TPS62851x is available in an 8-pin 1.60-mm

× 2.10-mm SOT583 package, offering a high power

density solution.